ZIF-8-DMTD@ALG气凝胶制备及对Pb(Ⅱ)、Cd(Ⅱ)吸附性能研究  

Preparation of ZIF-8-DMTD@ALG aerogels and their adsorption properties towards Pb(Ⅱ) and Cd(Ⅱ)

作　　者：侯慧 郭志强 周剑 吴新苗 HOU Hui;GUO Zhiqiang;ZHOU Jian;WU Xinmiao(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2024年第12期1585-1594,1622,共11页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(11775066)。

摘　　要：文章利用合成后改性法将2,5-二巯基-1,3,4-噻二唑(DMTD)引入沸石咪唑酯骨架材料(ZIF-8),通过共混法将其与海藻酸钠(ALG)复合成功制备出ZIF-8-DMTD@ALG气凝胶。ZIF-8-DMTD@ALG气凝胶解决了粉末状吸附剂易团聚和难以回收的问题,DMTD的引入为ZIF-8-DMTD@ALG气凝胶带来丰富的官能团,从而提高其吸附性能。静态批量吸附实验表明:ZIF-8-DMTD@ALG气凝胶对Pb(Ⅱ)和Cd(Ⅱ)的吸附均遵循准二级动力学模型和Langmuir吸附等温模型;Langmuir模型拟合出的ZIF-8-DMTD@ALG对Pb(Ⅱ)和Cd(Ⅱ)的最大吸附容量分别达到352.101、170.592 mg/g。离子强度实验和循环吸附实验表明ZIF-8-DMTD@ALG气凝胶具有良好的耐盐性能和再生能力。表征技术和批量吸附实验结果揭示了ZIF-8-DMTD@ALG气凝胶主要通过络合作用吸附Pb(Ⅱ)和Cd(Ⅱ),少量的离子交换和静电作用也对吸附做出了贡献。该研究结果表明ZIF-8-DMTD@ALG气凝胶具有制备简单、回收容易和吸附能力强等优点,在实际污水处理领域有良好的应用前景。In this paper,2,5-dimercapto-1,3,4-thiadiazole(DMTD)was introduced into zeolitic imidazolate framework material(ZIF-8)by post-synthesis modification method,and then combined with sodium alginate(ALG)by blending method to prepare ZIF-8-DMTD@ALG aerogels.ZIF-8-DMTD@ALG aerogels solve the problems that powder adsorbents are easy to agglomerate and difficult to recover.The introduction of DMTD brings abundant functional groups to ZIF-8-DMTD@ALG aerogels and improves their adsorption performance.The static batch adsorption experiments showed that the adsorption of Pb(Ⅱ)and Cd(Ⅱ)by ZIF-8-DMTD@ALG aerogels followed the quasi-second-order kinetic model and Langmuir adsorption isothermal model.The maximum adsorption capacities of ZIF-8-DMTD@ALG for Pb(Ⅱ)and Cd(Ⅱ)obtained by Langmuir model reached 352.101 mg/g and 170.592 mg/g,respectively.Ionic strength experiments and cyclic adsorption experiments showed that ZIF-8-DMTD@ALG aerogels had good salt resistance and regeneration ability.Characterization techniques and batch adsorption experiments revealed that ZIF-8-DMTD@ALG aerogels mainly adsorbed Pb(Ⅱ)and Cd(Ⅱ)through complexation,and a small amount of ion exchange and electrostatic interaction also contributed to the adsorption.The results show that ZIF-8-DMTD@ALG aerogels have the advantages of simple preparation,easy recovery and strong adsorption capacity,and have a good application prospect in the field of sewage treatment.

关 键 词：合成后改性法 ZIF-8 气凝胶 海藻酸钠(ALG) 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]